JPS6228003U

JPS6228003U -

Info

Publication number: JPS6228003U
Application number: JP11933785U
Authority: JP
Priority date: 1985-08-05
Filing date: 1985-08-05
Publication date: 1987-02-20

Description

[Brief explanation of drawings]

第１図は本考案の実施例１によるバルブシート
周囲の面取部の形状を示す断面図、第２図は本考
案の実施例１による内燃機関のバルブシートの周
辺を示す断面図、第３図は本考案の実施例２のバ
ルブシート周囲の面取部の形状を示す断面図、第
４図は従来の内燃機関のバルブシートの周辺を示
す断面図である。１……シリンダヘツド、２……排気バルブシー
ト、３′……吸気バルブシート、４……排気バル
ブ、５……吸気バルブ、６……シリンダブロツク
、７′，８′……面取部、９……ヘツドガスケツ
ト、ｅ……偏心（オフセツト）、Ｅ……バルブシ
ート中心軸線、Ｄ……加工中心軸線。 FIG. 1 is a sectional view showing the shape of a chamfered portion around a valve seat according to Embodiment 1 of the present invention, FIG. 2 is a sectional view showing the periphery of a valve seat of an internal combustion engine according to Embodiment 1 of the present invention, and FIG. The figure is a sectional view showing the shape of a chamfered portion around a valve seat according to a second embodiment of the present invention, and FIG. 4 is a sectional view showing the periphery of a valve seat of a conventional internal combustion engine. 1... Cylinder head, 2... Exhaust valve seat, 3'... Intake valve seat, 4... Exhaust valve, 5... Intake valve, 6... Cylinder block, 7', 8'... Chamfered portion, 9...Head gasket, e...Eccentricity (offset), E...Valve seat center axis, D...Machining center axis.

Claims

[Claims for Utility Model Registration] 1. In a multi-cylinder engine in which intake valves and exhaust valves are arranged in a row across multiple cylinders, the valve seats of the intake valves and/or exhaust valves are recessed from the wall surface of the combustion chamber. The inner wall of the combustion chamber around the valve seat is chamfered on the side closer to the center of the combustion chamber around a machining axis that is offset closer to the center of the combustion chamber than the axis of the valve seat, and on the side away from the center of the combustion chamber. The shape of the valve seat part of an engine is characterized in that the shaft center of the valve seat or a shaft offset from the shaft center of the valve seat toward the center of the combustion chamber is chamfered as a machining shaft. 2. The combustion chamber wall around the valve seat is chamfered on the side closer to the center of the combustion chamber and the side farther from the center of the combustion chamber around the same machining axis that is offset toward the center of the combustion chamber from the axis of the valve seat. Valve seat shape according to registered claim 1.